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authorYinghai Lu <yhlu.kernel.send@gmail.com>2008-04-23 17:56:30 -0400
committerJesse Barnes <jbarnes@hobbes.lan>2008-04-29 12:11:12 -0400
commit8e149e09f91098fd72bf9ac5b4a77a693abf721e (patch)
treee0aae800a75a478820494ddce42291f896014012 /include
parent2768f92c06a59c3ebf17a6b86002c3f33ab61a28 (diff)
pci/irq: restore mask_bits in msi shutdown -v3
[PATCH 1/2] pci/irq: restore mask_bits in msi shutdown -v3 Yinghai found that kexec'ing a RHEL 5.1 kernel with 2.6.25-rc3+ kernels prevents his NIC from working. He bisected to | commit 89d694b9dbe769ca1004e01db0ca43964806a611 | Author: Thomas Gleixner <tglx@linutronix.de> | Date: Mon Feb 18 18:25:17 2008 +0100 | | genirq: do not leave interupts enabled on free_irq | | The default_disable() function was changed in commit: | | 76d2160147f43f982dfe881404cfde9fd0a9da21 | genirq: do not mask interrupts by default | For MSI, default_shutdown will call mask_bit for msi device. All mask bits will left disabled after free_irq. Then in the kexec case, the next kernel can only use msi_enable bit, so all device's MSI can not be used. So lets to restore the mask bit to its pci reset defined value (enabled) when we disable the kernels use of msi to be a little friendlier to kexec'd kernels. Extend msi_set_mask_bit to msi_set_mask_bits to take mask, so we can fully restore that to 0x00 instead of 0xfe. Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> Signed-off-by: Jesse Barnes <jbarnes@hobbes.lan>
Diffstat (limited to 'include')
-rw-r--r--include/linux/msi.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/msi.h b/include/linux/msi.h
index 94bb46d82efd..8f2939227207 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -22,6 +22,7 @@ struct msi_desc {
22 __u8 masked : 1; 22 __u8 masked : 1;
23 __u8 is_64 : 1; /* Address size: 0=32bit 1=64bit */ 23 __u8 is_64 : 1; /* Address size: 0=32bit 1=64bit */
24 __u8 pos; /* Location of the msi capability */ 24 __u8 pos; /* Location of the msi capability */
25 __u32 maskbits_mask; /* mask bits mask */
25 __u16 entry_nr; /* specific enabled entry */ 26 __u16 entry_nr; /* specific enabled entry */
26 unsigned default_irq; /* default pre-assigned irq */ 27 unsigned default_irq; /* default pre-assigned irq */
27 }msi_attrib; 28 }msi_attrib;