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authorreinoud <reinoud@NetBSD.org>2010-12-22 14:05:50 +0000
committerreinoud <reinoud@NetBSD.org>2010-12-22 14:05:50 +0000
commit0819ccbf0d83e98c57f753ce1e4a79540c0c7991 (patch)
tree1e10a4f8d1165c259e7cd9f8e1634b3f26ad02f7 /sys/dev/dm/dm_pdev.c
parentbe222fea33bd5be12645c7d4725184f338abefa4 (diff)
Fix nestio's behavior on error.
The mbp->b_resid is used to track if all the nested buffers have been issued and reported back. When the last buffer calls in, mbp->b_resid becomes zero and biodone(mbp) is called. This is fine as long as there are no errors. If a read-error does occure in one of the nested buffers, the mbp->b_error is set and on its call to biodone(mbp), with mbp->b_resid is zero, physio() panics since it asserts that IF an error is set on a buffer, there should be a residual amount of data left to transfered. The patch fixes this case by setting mbp->b_resid back to mbp->b_bcount on mbp->b_error just before biodone(mbp). This behaviour is consistent with normal buffer issueing. It either succeeds or doesn't succeed.
Diffstat (limited to 'sys/dev/dm/dm_pdev.c')
0 files changed, 0 insertions, 0 deletions