From 46817769edb239b511a63345ba2f3c87803f1c14 Mon Sep 17 00:00:00 2001 From: Alexander Gordeev Date: Wed, 19 Feb 2014 09:58:19 +0100 Subject: skd: Fix incomplete cleanup of MSI-X interrupt When enabling MSI-X interrupts fails due to lack of memory the call to pci_disable_msix() is missed and the device is left with MSI-X interrupts enabled while the driver assumes otherwise. This update fixes the described misbehaviour and cleans up the code of skd_release_msix() function. Signed-off-by: Alexander Gordeev Cc: Jens Axboe Cc: Bartlomiej Zolnierkiewicz Cc: Kyungmin Park Cc: linux-pci@vger.kernel.org Signed-off-by: Jens Axboe --- drivers/block/skd_main.c | 50 +++++++++++++++++++++++++----------------------- 1 file changed, 26 insertions(+), 24 deletions(-) (limited to 'drivers/block') diff --git a/drivers/block/skd_main.c b/drivers/block/skd_main.c index 3fa0918ddaf8..d0550ba948fa 100644 --- a/drivers/block/skd_main.c +++ b/drivers/block/skd_main.c @@ -3910,43 +3910,44 @@ static void skd_release_msix(struct skd_device *skdev) struct skd_msix_entry *qentry; int i; - if (skdev->msix_entries == NULL) - return; - for (i = 0; i < skdev->msix_count; i++) { - qentry = &skdev->msix_entries[i]; - skdev = qentry->rsp; + if (skdev->msix_entries) { + for (i = 0; i < skdev->msix_count; i++) { + qentry = &skdev->msix_entries[i]; + skdev = qentry->rsp; + + if (qentry->have_irq) + devm_free_irq(&skdev->pdev->dev, + qentry->vector, qentry->rsp); + } - if (qentry->have_irq) - devm_free_irq(&skdev->pdev->dev, - qentry->vector, qentry->rsp); + kfree(skdev->msix_entries); } - pci_disable_msix(skdev->pdev); - kfree(skdev->msix_entries); + + if (skdev->msix_count) + pci_disable_msix(skdev->pdev); + skdev->msix_count = 0; skdev->msix_entries = NULL; } static int skd_acquire_msix(struct skd_device *skdev) { - int i, rc; - struct pci_dev *pdev; - struct msix_entry *entries = NULL; + int i, rc, msix_count = SKD_MAX_MSIX_COUNT; + struct pci_dev *pdev = skdev->pdev; + struct msix_entry *entries; struct skd_msix_entry *qentry; - pdev = skdev->pdev; - skdev->msix_count = SKD_MAX_MSIX_COUNT; - entries = kzalloc(sizeof(struct msix_entry) * SKD_MAX_MSIX_COUNT, - GFP_KERNEL); + entries = kzalloc(sizeof(struct msix_entry) * msix_count, GFP_KERNEL); if (!entries) return -ENOMEM; - for (i = 0; i < SKD_MAX_MSIX_COUNT; i++) + for (i = 0; i < msix_count; i++) entries[i].entry = i; - rc = pci_enable_msix(pdev, entries, SKD_MAX_MSIX_COUNT); + rc = pci_enable_msix(pdev, entries, msix_count); if (rc < 0) goto msix_out; - if (rc) { + else if (rc) { if (rc < SKD_MIN_MSIX_COUNT) { pr_err("(%s): failed to enable MSI-X %d\n", skd_name(skdev), rc); @@ -3956,20 +3957,21 @@ static int skd_acquire_msix(struct skd_device *skdev) skdev->name, __func__, __LINE__, pci_name(pdev), skdev->name, rc); - skdev->msix_count = rc; - rc = pci_enable_msix(pdev, entries, skdev->msix_count); + msix_count = rc; + rc = pci_enable_msix(pdev, entries, msix_count); if (rc) { pr_err("(%s): failed to enable MSI-X " "support (%d) %d\n", - skd_name(skdev), skdev->msix_count, rc); + skd_name(skdev), msix_count, rc); goto msix_out; } } + + skdev->msix_count = msix_count; skdev->msix_entries = kzalloc(sizeof(struct skd_msix_entry) * skdev->msix_count, GFP_KERNEL); if (!skdev->msix_entries) { rc = -ENOMEM; - skdev->msix_count = 0; pr_err("(%s): msix table allocation error\n", skd_name(skdev)); goto msix_out; -- cgit v1.2.3