Message ID | 1454796693-4446-1-git-send-email-robert.jarzmik@free.fr |
---|---|
State | Changes Requested, archived |
Delegated to: | David Miller |
Headers | show |
Robert Jarzmik <robert.jarzmik@free.fr> : [...] > diff --git a/drivers/net/ethernet/davicom/dm9000.c b/drivers/net/ethernet/davicom/dm9000.c > index cf94b72dbacd..2bae5c8c1f85 100644 > --- a/drivers/net/ethernet/davicom/dm9000.c > +++ b/drivers/net/ethernet/davicom/dm9000.c [...] > @@ -1500,15 +1496,21 @@ dm9000_probe(struct platform_device *pdev) > > db->addr_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > db->data_res = platform_get_resource(pdev, IORESOURCE_MEM, 1); > - db->irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); > > - if (db->addr_res == NULL || db->data_res == NULL || > - db->irq_res == NULL) { > - dev_err(db->dev, "insufficient resources\n"); > + if (!db->addr_res || !db->data_res) { > + dev_err(db->dev, "insufficient resources addr=%p data=%p\n", > + db->addr_res, db->data_res); > ret = -ENOENT; > goto out; > } > > + ndev->irq = platform_get_irq(pdev, 0); > + if (ndev->irq < 0) { > + dev_err(db->dev, "interrupt resource unavailable: %d\n", > + ndev->irq); > + return ndev->irq; > + } > + Leak: please set 'ret = ndev->irq;' and proceed to the 'out' label. If you have some spare time, it would be nice to avoid db->irq_wake leak on probe failure or driver removal.
Francois Romieu <romieu@fr.zoreil.com> writes: > Robert Jarzmik <robert.jarzmik@free.fr> : > [...] >> diff --git a/drivers/net/ethernet/davicom/dm9000.c b/drivers/net/ethernet/davicom/dm9000.c >> index cf94b72dbacd..2bae5c8c1f85 100644 >> --- a/drivers/net/ethernet/davicom/dm9000.c >> +++ b/drivers/net/ethernet/davicom/dm9000.c > [...] >> @@ -1500,15 +1496,21 @@ dm9000_probe(struct platform_device *pdev) >> >> db->addr_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); >> db->data_res = platform_get_resource(pdev, IORESOURCE_MEM, 1); >> - db->irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); >> >> - if (db->addr_res == NULL || db->data_res == NULL || >> - db->irq_res == NULL) { >> - dev_err(db->dev, "insufficient resources\n"); >> + if (!db->addr_res || !db->data_res) { >> + dev_err(db->dev, "insufficient resources addr=%p data=%p\n", >> + db->addr_res, db->data_res); >> ret = -ENOENT; >> goto out; >> } >> >> + ndev->irq = platform_get_irq(pdev, 0); >> + if (ndev->irq < 0) { >> + dev_err(db->dev, "interrupt resource unavailable: %d\n", >> + ndev->irq); >> + return ndev->irq; >> + } >> + > > Leak: please set 'ret = ndev->irq;' and proceed to the 'out' label. Indeed, the etherdev, good catch. > If you have some spare time, it would be nice to avoid db->irq_wake leak > on probe failure or driver removal. Sorry but not in this patch. I suppose the right patch would be to use devm_*() in the probe function for ioremaps and request_irqs, which would address this point. Cheers.
Hello. On 2/7/2016 1:11 AM, Robert Jarzmik wrote: > The dm9000 driver doesn't work in at least one device-tree > configuration, spitting an error message on irq resource : > [ 1.062495] dm9000 8000000.ethernet: insufficient resources > [ 1.068439] dm9000 8000000.ethernet: not found (-2). > [ 1.073451] dm9000: probe of 8000000.ethernet failed with error -2 > > The reason behind is that the interrupt might be provided by a gpio > controller, not probed when dm9000 is probed, and needing the probe > deferral mechanism to apply. > > Currently, the interrupt is directly taken from resources. This patch > changes this to use the more generic platform_get_irq(), which handles > the deferral. > > Moreover, since commit Fixes: 7085a7401ba5 ("drivers: platform: parse Fixes: tag here? > IRQ flags from resources"), the interrupt trigger flags are honored in > platform_get_irq(), so remove the needless code in dm9000. > > Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr> > Acked-by: Marcel Ziswiler <marcel@ziswiler.com> > Cc: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> > --- > Since v1: comment style and requested irq test < 0 > David, you should know that Sergei is concerned with the > subsystem prefix in the patch subject (too long for him). > --- > drivers/net/ethernet/davicom/dm9000.c | 29 +++++++++++++++-------------- > 1 file changed, 15 insertions(+), 14 deletions(-) > > diff --git a/drivers/net/ethernet/davicom/dm9000.c b/drivers/net/ethernet/davicom/dm9000.c > index cf94b72dbacd..2bae5c8c1f85 100644 > --- a/drivers/net/ethernet/davicom/dm9000.c > +++ b/drivers/net/ethernet/davicom/dm9000.c [...] > @@ -1300,18 +1299,15 @@ static int > dm9000_open(struct net_device *dev) > { > struct board_info *db = netdev_priv(dev); > - unsigned long irqflags = db->irq_res->flags & IRQF_TRIGGER_MASK; > + unsigned long irqflags = 0; > > if (netif_msg_ifup(db)) > dev_dbg(db->dev, "enabling %s\n", dev->name); > > - /* If there is no IRQ type specified, default to something that > - * may work, and tell the user that this is a problem */ > - > - if (irqflags == IRQF_TRIGGER_NONE) > - irqflags = irq_get_trigger_type(dev->irq); > - > - if (irqflags == IRQF_TRIGGER_NONE) > + /* If there is no IRQ type specified, tell the user that this is a > + * problem > + */ > + if (irq_get_trigger_type(dev->irq) == IRQF_TRIGGER_NONE) > dev_warn(db->dev, "WARNING: no IRQ resource flags set.\n"); > > irqflags |= IRQF_SHARED; Why not just initialize to IRQF_SHARED? But actually you don't need this variable anymore. > @@ -1500,15 +1496,21 @@ dm9000_probe(struct platform_device *pdev) > > db->addr_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > db->data_res = platform_get_resource(pdev, IORESOURCE_MEM, 1); > - db->irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); > > - if (db->addr_res == NULL || db->data_res == NULL || > - db->irq_res == NULL) { > - dev_err(db->dev, "insufficient resources\n"); > + if (!db->addr_res || !db->data_res) { > + dev_err(db->dev, "insufficient resources addr=%p data=%p\n", > + db->addr_res, db->data_res); > ret = -ENOENT; > goto out; > } > > + ndev->irq = platform_get_irq(pdev, 0); > + if (ndev->irq < 0) { > + dev_err(db->dev, "interrupt resource unavailable: %d\n", > + ndev->irq); > + return ndev->irq; As already noted, direct *return* can't be used here. [...] MBR, Sergei
Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> writes: >> Moreover, since commit Fixes: 7085a7401ba5 ("drivers: platform: parse > > Fixes: tag here? Heuh no. It doesn't fix this commit, it uses a feature brought by this commit. >> + if (irq_get_trigger_type(dev->irq) == IRQF_TRIGGER_NONE) >> dev_warn(db->dev, "WARNING: no IRQ resource flags set.\n"); >> >> irqflags |= IRQF_SHARED; > > Why not just initialize to IRQF_SHARED? > But actually you don't need this variable anymore. Yeah, makes sense. Cheers.
Robert Jarzmik <robert.jarzmik@free.fr> : > Francois Romieu <romieu@fr.zoreil.com> writes: [...] > > If you have some spare time, it would be nice to avoid db->irq_wake leak > > on probe failure or driver removal. > Sorry but not in this patch. Of course. Different topic => different patch. > I suppose the right patch would be to use devm_*() in the probe function for > ioremaps and request_irqs, which would address this point. I'd rather avoid devm_* on netdev.
diff --git a/drivers/net/ethernet/davicom/dm9000.c b/drivers/net/ethernet/davicom/dm9000.c index cf94b72dbacd..2bae5c8c1f85 100644 --- a/drivers/net/ethernet/davicom/dm9000.c +++ b/drivers/net/ethernet/davicom/dm9000.c @@ -128,7 +128,6 @@ struct board_info { struct resource *data_res; struct resource *addr_req; /* resources requested */ struct resource *data_req; - struct resource *irq_res; int irq_wake; @@ -1300,18 +1299,15 @@ static int dm9000_open(struct net_device *dev) { struct board_info *db = netdev_priv(dev); - unsigned long irqflags = db->irq_res->flags & IRQF_TRIGGER_MASK; + unsigned long irqflags = 0; if (netif_msg_ifup(db)) dev_dbg(db->dev, "enabling %s\n", dev->name); - /* If there is no IRQ type specified, default to something that - * may work, and tell the user that this is a problem */ - - if (irqflags == IRQF_TRIGGER_NONE) - irqflags = irq_get_trigger_type(dev->irq); - - if (irqflags == IRQF_TRIGGER_NONE) + /* If there is no IRQ type specified, tell the user that this is a + * problem + */ + if (irq_get_trigger_type(dev->irq) == IRQF_TRIGGER_NONE) dev_warn(db->dev, "WARNING: no IRQ resource flags set.\n"); irqflags |= IRQF_SHARED; @@ -1500,15 +1496,21 @@ dm9000_probe(struct platform_device *pdev) db->addr_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); db->data_res = platform_get_resource(pdev, IORESOURCE_MEM, 1); - db->irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); - if (db->addr_res == NULL || db->data_res == NULL || - db->irq_res == NULL) { - dev_err(db->dev, "insufficient resources\n"); + if (!db->addr_res || !db->data_res) { + dev_err(db->dev, "insufficient resources addr=%p data=%p\n", + db->addr_res, db->data_res); ret = -ENOENT; goto out; } + ndev->irq = platform_get_irq(pdev, 0); + if (ndev->irq < 0) { + dev_err(db->dev, "interrupt resource unavailable: %d\n", + ndev->irq); + return ndev->irq; + } + db->irq_wake = platform_get_irq(pdev, 1); if (db->irq_wake >= 0) { dev_dbg(db->dev, "wakeup irq %d\n", db->irq_wake); @@ -1570,7 +1572,6 @@ dm9000_probe(struct platform_device *pdev) /* fill in parameters for net-dev structure */ ndev->base_addr = (unsigned long)db->io_addr; - ndev->irq = db->irq_res->start; /* ensure at least we have a default set of IO routines */ dm9000_set_io(db, iosize);