Am Dienstag, 18. März 2003 16:12 schrieb Alan Stern:
On Tue, 18 Mar 2003, Oliver Neukum wrote:
Hi,
some part of the synchronous API is used in the block io error handling
code paths. Therefore it may use only GFP_NOIO, not GFP_KERNEL.
Greg, please apply.
Oliver, is this meant to refer to the usb-storage module or to something
else? For usb-storage it's true that the synchronous API is used in the
Mainly usb-storage, but there's no reason a network driver used by nfs
might not suffer from a stall needing to be cleared.
I/O error handling code paths. But those code paths always execute in the
context of a kernel thread -- the SCSI error-handler thread -- with no
semaphores held, so it's perfectly okay for them to use GFP_KERNEL.
How can that be? The SCSI layer guarantees that no further requests are
issued while the error handler is running.
Regards
Oliver
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