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PCI: endpoint: Return error if EPC is started/stopped multiple times

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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.

Link: https://lore.kernel.org/r/20230602114756.36586-4-manivannan.sadhasivam@linaro.org
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Kishon Vijay Abraham I <kishon@kernel.org>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
This commit is contained in:
Manivannan Sadhasivam
2023-06-02 17:17:50 +05:30
committed by Bjorn Helgaas
parent 081c715dfd
commit a504c96558
1 changed files with 3 additions and 0 deletions
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3
drivers/pci/endpoint/pci-ep-cfs.c
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@ -179,6 +179,9 @@ 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;