The patch titled pci/msi: fix msi_mask() has been added to the -mm tree. Its filename is pci-msi-fix-msi_mask.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find out what to do about this The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ Subject: pci/msi: fix msi_mask() From: Hidetoshi Seto <seto.hidetoshi@xxxxxxxxxxxxxx> Commit bffac3c593eba1f9da3efd0199e49ea6558a40ce ("PCI MSI: Fix undefined shift by 32") does: - temp = (1 << multi_msi_capable(control)); - temp = ((temp - 1) & ~temp); + temp = msi_mask((control & PCI_MSI_FLAGS_QMASK) >> 1); and provides msi_mask() to avoid undefined shift by 32. According to PCI Local Bus Spec 3.0 "6.8.1.3 Message Control for MSI", relations between the encoded bits in control register, the number of vectors and the proper maskbits should be as following table: control[3::1] | vectors | maskbits --------------+----------+----------- 000b | 1 | 0x1 001b | 2 | 0x3 010b | 4 | 0xf 011b | 8 | 0xff 100b | 16 | 0xffff 101b | 32 | 0xffffffff 110b | Reserved | n/a 111b | Reserved | n/a This patch fixes the wrong array in the msi_mask(). Signed-off-by: Hidetoshi Seto <seto.hidetoshi@xxxxxxxxxxxxxx> Cc: Matthew Wilcox <matthew@xxxxxx> Cc: Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- drivers/pci/msi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff -puN drivers/pci/msi.c~pci-msi-fix-msi_mask drivers/pci/msi.c --- a/drivers/pci/msi.c~pci-msi-fix-msi_mask +++ a/drivers/pci/msi.c @@ -109,7 +109,7 @@ static void msix_set_enable(struct pci_d */ static inline __attribute_const__ u32 msi_mask(unsigned x) { - static const u32 mask[] = { 1, 2, 4, 0xf, 0xff, 0xffff, 0xffffffff }; + static const u32 mask[] = { 1, 3, 0xf, 0xff, 0xffff, 0xffffffff }; return mask[x]; } _ Patches currently in -mm which might be from seto.hidetoshi@xxxxxxxxxxxxxx are linux-next.patch pci-msi-fix-msi_mask.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html