The fix is to write 'MPI_HIM_DIM' to the Host Interrupt Mask register, when enabling interrupts. Instead of the tilde of MPI_HIM_RIM. Apparently writing '1's to some of the reserved bits was causing all the bits to go to `1`, which effectly disabled all interrupts. Signed-off-by: Eric Moore <Eric.Moore@xxxxxxxx> diff -uarN b/drivers/message/fusion/mptbase.c a/drivers/message/fusion/mptbase.c --- b/drivers/message/fusion/mptbase.c 2006-01-13 15:42:07.000000000 -0700 +++ a/drivers/message/fusion/mptbase.c 2006-01-13 15:50:02.000000000 -0700 @@ -1630,7 +1630,7 @@ pci_enable_device(pdev); /* enable interrupts */ - CHIPREG_WRITE32(&ioc->chip->IntMask, ~(MPI_HIM_RIM)); + CHIPREG_WRITE32(&ioc->chip->IntMask, MPI_HIM_DIM); ioc->active = 1; /* F/W not running */ @@ -1723,7 +1723,7 @@ /* (re)Enable alt-IOC! (reply interrupt, FreeQ) */ dprintk((KERN_INFO MYNAM ": alt-%s reply irq re-enabled\n", ioc->alt_ioc->name)); - CHIPREG_WRITE32(&ioc->alt_ioc->chip->IntMask, ~(MPI_HIM_RIM)); + CHIPREG_WRITE32(&ioc->alt_ioc->chip->IntMask, MPI_HIM_DIM); ioc->alt_ioc->active = 1; } @@ -1839,7 +1839,7 @@ if (ret == 0) { /* Enable! (reply interrupt) */ - CHIPREG_WRITE32(&ioc->chip->IntMask, ~(MPI_HIM_RIM)); + CHIPREG_WRITE32(&ioc->chip->IntMask, MPI_HIM_DIM); ioc->active = 1; } @@ -1847,7 +1847,7 @@ /* (re)Enable alt-IOC! (reply interrupt) */ dinitprintk((KERN_INFO MYNAM ": alt-%s reply irq re-enabled\n", ioc->alt_ioc->name)); - CHIPREG_WRITE32(&ioc->alt_ioc->chip->IntMask, ~(MPI_HIM_RIM)); + CHIPREG_WRITE32(&ioc->alt_ioc->chip->IntMask, MPI_HIM_DIM); ioc->alt_ioc->active = 1; } - : send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html