Messages in this thread Patch in this message | | | Date | Sun, 16 Nov 2008 23:17:10 -0800 | From | Greg KH <> | Subject | [patch 43/46] ACPI: EC: wait for last write gpe |
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2.6.27-stable review patch. If anyone has any objections, please let us know.
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From: Alexey Starikovskiy <astarikovskiy@suse.de>
commit dd15f8c42af09031e27da5b4d697ce925511f2e1 upstream.
There is a possibility that EC might break if next command is issued within 1 us after write or burst-disable command.
Suggestd-by: Zhao Yakui <yakui.zhao@intel.com> Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de> Signed-off-by: Len Brown <len.brown@intel.com> Cc: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--- drivers/acpi/ec.c | 21 +++++++++++++-------- 1 file changed, 13 insertions(+), 8 deletions(-)
--- a/drivers/acpi/ec.c +++ b/drivers/acpi/ec.c @@ -102,6 +102,7 @@ struct transaction { u8 command; u8 wlen; u8 rlen; + bool done; }; static struct acpi_ec { @@ -178,7 +179,7 @@ static int ec_transaction_done(struct ac unsigned long flags; int ret = 0; spin_lock_irqsave(&ec->curr_lock, flags); - if (!ec->curr || (!ec->curr->wlen && !ec->curr->rlen)) + if (!ec->curr || ec->curr->done) ret = 1; spin_unlock_irqrestore(&ec->curr_lock, flags); return ret; @@ -195,17 +196,20 @@ static void gpe_transaction(struct acpi_ acpi_ec_write_data(ec, *(ec->curr->wdata++)); --ec->curr->wlen; } else - /* false interrupt, state didn't change */ - ++ec->curr->irq_count; - + goto err; } else if (ec->curr->rlen > 0) { if ((status & ACPI_EC_FLAG_OBF) == 1) { *(ec->curr->rdata++) = acpi_ec_read_data(ec); - --ec->curr->rlen; + if (--ec->curr->rlen == 0) + ec->curr->done = true; } else - /* false interrupt, state didn't change */ - ++ec->curr->irq_count; - } + goto err; + } else if (ec->curr->wlen == 0 && (status & ACPI_EC_FLAG_IBF) == 0) + ec->curr->done = true; + goto unlock; +err: + /* false interrupt, state didn't change */ + ++ec->curr->irq_count; unlock: spin_unlock_irqrestore(&ec->curr_lock, flags); } @@ -265,6 +269,7 @@ static int acpi_ec_transaction_unlocked( spin_lock_irqsave(&ec->curr_lock, tmp); /* following two actions should be kept atomic */ t->irq_count = 0; + t->done = false; ec->curr = t; acpi_ec_write_cmd(ec, ec->curr->command); if (ec->curr->command == ACPI_EC_COMMAND_QUERY) --
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