diff mbox series

[v6,3/9] PCI: endpoint: Return error if EPC is started/stopped multiple times

Message ID 20230602114756.36586-4-manivannan.sadhasivam@linaro.org
State New
Headers show
Series Add support for MHI Endpoint function driver | expand

Commit Message

Manivannan Sadhasivam June 2, 2023, 11:47 a.m. UTC 
When the EPC is started or stopped multiple times from configfs, just
return -EALREADY. There is no need to call the EPC start/stop functions
in those cases.

Reviewed-by: Kishon Vijay Abraham I <kishon@kernel.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
 drivers/pci/endpoint/pci-ep-cfs.c | 3 +++
 1 file changed, 3 insertions(+)

Comments

Damien Le Moal June 2, 2023, 12:14 p.m. UTC | #1 
On 6/2/23 20:47, Manivannan Sadhasivam wrote:
> When the EPC is started or stopped multiple times from configfs, just
> return -EALREADY. There is no need to call the EPC start/stop functions
> in those cases.
> 
> Reviewed-by: Kishon Vijay Abraham I <kishon@kernel.org>
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>

Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
diff mbox series

Patch

diff --git a/drivers/pci/endpoint/pci-ep-cfs.c b/drivers/pci/endpoint/pci-ep-cfs.c
index 4b8ac0ac84d5..7e0e430e4ceb 100644
--- a/drivers/pci/endpoint/pci-ep-cfs.c
+++ b/drivers/pci/endpoint/pci-ep-cfs.c
@@ -178,6 +178,9 @@  static ssize_t pci_epc_start_store(struct config_item *item, const char *page,
 	if (kstrtobool(page, &start) < 0)
 		return -EINVAL;
 
+	if (start == epc_group->start)
+		return -EALREADY;
+
 	if (!start) {
 		pci_epc_stop(epc);
 		epc_group->start = 0;