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drivers/misc/sgi-gru: fix dereference of ERR_PTR 

gru_alloc_gts() can fail and it can return ERR_PTR(errvalue). We should
not dereference it if it has returned error. And incase it has returned
error then wait for some time and try again.

Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
Acked-by: Dimitri Sivanich <sivanich@sgi.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sudip Mukherjee 2015-09-04 09:56:20 +05:30 committed by Greg Kroah-Hartman
parent c2ed545cee
commit bba57f8f94
1 changed files with 6 additions and 1 deletions
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5
drivers/misc/sgi-gru/grukservices.c
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@ -160,7 +160,12 @@ static void gru_load_kernel_context(struct gru_blade_state *bs, int blade_id)
down_write(&bs->bs_kgts_sema);
if (!bs->bs_kgts) {
do {
bs->bs_kgts = gru_alloc_gts(NULL, 0, 0, 0, 0, 0);
if (!IS_ERR(bs->bs_kgts))
break;
msleep(1);
} while (true);
bs->bs_kgts->ts_user_blade_id = blade_id;
}
kgts = bs->bs_kgts;