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author | Wei Liu <wei.liu2@citrix.com> | 2013-10-28 12:07:57 (GMT) |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-11-20 20:37:36 (GMT) |
commit | b6842aabed83d7e22f11a6b24f38be874a4b2320 (patch) | |
tree | 53841f2a4da1ca281e8ef28b6a614da68881e299 /net/decnet | |
parent | 5a2851884a79b740cf4af66149e1ba594357a92c (diff) | |
download | linux-fsl-qoriq-b6842aabed83d7e22f11a6b24f38be874a4b2320.tar.xz |
xen-netback: use jiffies_64 value to calculate credit timeout
[ Upstream commit 059dfa6a93b779516321e5112db9d7621b1367ba ]
time_after_eq() only works if the delta is < MAX_ULONG/2.
For a 32bit Dom0, if netfront sends packets at a very low rate, the time
between subsequent calls to tx_credit_exceeded() may exceed MAX_ULONG/2
and the test for timer_after_eq() will be incorrect. Credit will not be
replenished and the guest may become unable to send packets (e.g., if
prior to the long gap, all credit was exhausted).
Use jiffies_64 variant to mitigate this problem for 32bit Dom0.
Suggested-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Reviewed-by: David Vrabel <david.vrabel@citrix.com>
Cc: Ian Campbell <ian.campbell@citrix.com>
Cc: Jason Luan <jianhai.luan@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/decnet')
0 files changed, 0 insertions, 0 deletions