From patchwork Tue Jun 22 16:57:42 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [2/2] mtd: m25p80: Make jedec_probe() return proper errno values Date: Tue, 22 Jun 2010 06:57:42 -0000 From: Anton Vorontsov X-Patchwork-Id: 56534 Message-Id: <20100622165742.GB20699@oksana.dev.rtsoft.ru> To: David Woodhouse Cc: David Brownell , Mike Frysinger , Artem Bityutskiy , Barry Song <21cnbao@gmail.com>, linux-kernel@vger.kernel.org, linuxppc-dev@ozlabs.org, linux-mtd@lists.infradead.org, uclinux-dist-devel@blackfin.uclinux.org, Andrew Morton spi_write_then_read() may return its own return codes (e.g. -EIO), so let's propagate the value down to the probe(). Also, remove jedec == 0 check, it isn't needed as nowadays we use dedicated SPI device IDs for non-JEDEC flashes. Suggested-by: Barry Song <21cnbao@gmail.com> Signed-off-by: Anton Vorontsov --- This is for 2.6.36. drivers/mtd/devices/m25p80.c | 18 ++++++------------ 1 files changed, 6 insertions(+), 12 deletions(-) diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c index a610ca9..7bf5c45 100644 --- a/drivers/mtd/devices/m25p80.c +++ b/drivers/mtd/devices/m25p80.c @@ -16,6 +16,8 @@ */ #include +#include +#include #include #include #include @@ -733,7 +735,7 @@ static const struct spi_device_id *__devinit jedec_probe(struct spi_device *spi) if (tmp < 0) { DEBUG(MTD_DEBUG_LEVEL0, "%s: error %d reading JEDEC ID\n", dev_name(&spi->dev), tmp); - return NULL; + return ERR_PTR(tmp); } jedec = id[0]; jedec = jedec << 8; @@ -741,14 +743,6 @@ static const struct spi_device_id *__devinit jedec_probe(struct spi_device *spi) jedec = jedec << 8; jedec |= id[2]; - /* - * Some chips (like Numonyx M25P80) have JEDEC and non-JEDEC variants, - * which depend on technology process. Officially RDID command doesn't - * exist for non-JEDEC chips, but for compatibility they return ID 0. - */ - if (jedec == 0) - return NULL; - ext_jedec = id[3] << 8 | id[4]; for (tmp = 0; tmp < ARRAY_SIZE(m25p_ids) - 1; tmp++) { @@ -759,7 +753,7 @@ static const struct spi_device_id *__devinit jedec_probe(struct spi_device *spi) return &m25p_ids[tmp]; } } - return NULL; + return ERR_PTR(-ENODEV); } @@ -804,8 +798,8 @@ static int __devinit m25p_probe(struct spi_device *spi) const struct spi_device_id *jid; jid = jedec_probe(spi); - if (!jid) { - return -ENODEV; + if (IS_ERR(jid)) { + return PTR_ERR(jid); } else if (jid != id) { /* * JEDEC knows better, so overwrite platform ID. We