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s390/pci: try harder to modify a function

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In rare situations a PCI function can report a busy condition
when we issue the modify pci function command. A temporary busy
condition can exceed 1 second but not 2 seconds. Increase the
time until we report an error to 2 seconds. Also increase the
time we sleep between the retries to reduce the load in this
case.

Suggested-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Sebastian Ott 2013-08-29 19:38:33 +02:00 committed by Martin Schwidefsky
parent 1d57896638
commit d03abe5882
1 changed files with 2 additions and 2 deletions
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4
arch/s390/pci/pci_clp.c
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@ -179,7 +179,7 @@ int clp_add_pci_device(u32 fid, u32 fh, int configured)
static int clp_set_pci_fn(u32 *fh, u8 nr_dma_as, u8 command) static int clp_set_pci_fn(u32 *fh, u8 nr_dma_as, u8 command)
{ {
struct clp_req_rsp_set_pci *rrb; struct clp_req_rsp_set_pci *rrb;
int rc, retries = 1000; int rc, retries = 100;
rrb = clp_alloc_block(GFP_KERNEL); rrb = clp_alloc_block(GFP_KERNEL);
if (!rrb) if (!rrb)
@ -199,7 +199,7 @@ static int clp_set_pci_fn(u32 *fh, u8 nr_dma_as, u8 command)
retries--; retries--;
if (retries < 0) if (retries < 0)
break; break;
msleep(1); msleep(20);
} }
} while (rrb->response.hdr.rsp == CLP_RC_SETPCIFN_BUSY); } while (rrb->response.hdr.rsp == CLP_RC_SETPCIFN_BUSY);