From bba57f8f948239340e939cb25c7d858cd60ad9de Mon Sep 17 00:00:00 2001 From: Sudip Mukherjee Date: Fri, 4 Sep 2015 09:56:20 +0530 Subject: [PATCH] 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 Acked-by: Dimitri Sivanich Signed-off-by: Greg Kroah-Hartman --- drivers/misc/sgi-gru/grukservices.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/misc/sgi-gru/grukservices.c b/drivers/misc/sgi-gru/grukservices.c index 490b79a27c88..7812e34a1112 100644 --- a/drivers/misc/sgi-gru/grukservices.c +++ b/drivers/misc/sgi-gru/grukservices.c @@ -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) { - bs->bs_kgts = gru_alloc_gts(NULL, 0, 0, 0, 0, 0); + 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;