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Date: Mon, 7 Feb 2011 15:59:32 -0600 From: Stuart Hayes <stuart.w.hayes@...il.com> To: linux-kernel@...r.kernel.org, douglas_warzecha@...l.com, shyam_iyer@...l.com Subject: [RESEND PATCH] dcdbas: force SMI to happen when expected Resending from a different email address so I don't have to attach the patch as a file. The dcdbas driver can do an I/O write to cause a SMI to occur. On some sys= tems I/O writes are posted in the chipset and don't complete immediately. = This can result in the SMI happening at a later time. This can result in r= andom failures since the SMI handler expects the EBX register to contain a = pointer, and the handler can write to memory. Performing an I/O read to the same address as the I/O write will force the = I/O write to complete. The patch is against the 2.6.37 kernel and has been= tested. Signed-off-by: Stuart Hayes <stuart.w.hayes@...il.com> Acked-by: Doug Warzecha <douglas_warzecha@...l.com> --- diff -purN linux-2.6.37/drivers/firmware/dcdbas.c linux-2.6.37_test/drivers/firmware/dcdbas.c --- linux-2.6.37/drivers/firmware/dcdbas.c 2011-01-18 10:44:44.869882461 -0500 +++ linux-2.6.37_test/drivers/firmware/dcdbas.c 2011-01-18 10:41:15.404612154 -0500 @@ -278,6 +278,9 @@ int dcdbas_smi_request(struct smi_cmd *s : "memory" ); + /* read to force posted write through and make SMI happen now */ + inb(smi_cmd->command_address); + out: set_cpus_allowed_ptr(current, old_mask); free_cpumask_var(old_mask); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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