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Because the value to be restored is blindly assumed to be the negative of the enable argument, when a driver calls pcim_intx() unnecessarily for the already enabled state, it'll restore to the disabled state in turn. Also, when a driver calls pcim_intx() multiple times with different enable argument values, the last one will win no matter what value it is. This patch addresses those inconsistencies by saving the original INTX_DISABLE state at the first devres_alloc(); this assures that the original state is restored properly, and the later pcim_intx() calls won't overwrite res->orig_intx any longer. Fixes: 25216afc9db5 ("PCI: Add managed pcim_intx()") Link: https://lore.kernel.org/87v7xk2ps5.wl-tiwai@suse.de Signed-off-by: Takashi Iwai --- drivers/pci/devres.c | 18 ++++++++++++++---- 1 file changed, 14 insertions(+), 4 deletions(-) diff --git a/drivers/pci/devres.c b/drivers/pci/devres.c index b133967faef8..aed3c9a355cb 100644 --- a/drivers/pci/devres.c +++ b/drivers/pci/devres.c @@ -438,8 +438,17 @@ static void pcim_intx_restore(struct device *dev, void *data) __pcim_intx(pdev, res->orig_intx); } -static struct pcim_intx_devres *get_or_create_intx_devres(struct device *dev) +static void save_orig_intx(struct pci_dev *pdev, struct pcim_intx_devres *res) { + u16 pci_command; + + pci_read_config_word(pdev, PCI_COMMAND, &pci_command); + res->orig_intx = !(pci_command & PCI_COMMAND_INTX_DISABLE); +} + +static struct pcim_intx_devres *get_or_create_intx_devres(struct pci_dev *pdev) +{ + struct device *dev = &pdev->dev; struct pcim_intx_devres *res; res = devres_find(dev, pcim_intx_restore, NULL, NULL); @@ -447,8 +456,10 @@ static struct pcim_intx_devres *get_or_create_intx_devres(struct device *dev) return res; res = devres_alloc(pcim_intx_restore, sizeof(*res), GFP_KERNEL); - if (res) + if (res) { + save_orig_intx(pdev, res); devres_add(dev, res); + } return res; } @@ -467,11 +478,10 @@ int pcim_intx(struct pci_dev *pdev, int enable) { struct pcim_intx_devres *res; - res = get_or_create_intx_devres(&pdev->dev); + res = get_or_create_intx_devres(pdev); if (!res) return -ENOMEM; - res->orig_intx = !enable; __pcim_intx(pdev, enable); return 0;