linux-kernel - [PATCH] firewire: fw-ohci: dma_free

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Date:	Wed, 25 Jul 2007 19:18:08 +0200 (CEST)
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	linux1394-devel@...ts.sourceforge.net
cc:	Kristian Høgsberg <krh@...hat.com>,
	David Brownell <david-b@...bell.net>,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	Russell King <rmk@....linux.org.uk>,
	David Miller <davem@...emloft.net>
Subject: [PATCH] firewire: fw-ohci: dma_free_coherent needs IRQs enabled

Signed-off-by: Stefan Richter <stefanr@...6.in-berlin.de>
---
 drivers/firewire/fw-ohci.c |   24 +++++++++++++++---------
 1 file changed, 15 insertions(+), 9 deletions(-)

Index: linux/drivers/firewire/fw-ohci.c
===================================================================
--- linux.orig/drivers/firewire/fw-ohci.c
+++ linux/drivers/firewire/fw-ohci.c
@@ -907,6 +907,8 @@ static void bus_reset_tasklet(unsigned l
 	int self_id_count, i, j, reg;
 	int generation, new_generation;
 	unsigned long flags;
+	void *free_rom = NULL;
+	dma_addr_t free_rom_bus = 0;
 
 	reg = reg_read(ohci, OHCI1394_NodeID);
 	if (!(reg & OHCI1394_NodeID_idValid)) {
@@ -970,10 +972,10 @@ static void bus_reset_tasklet(unsigned l
 	 */
 
 	if (ohci->next_config_rom != NULL) {
-		if (ohci->next_config_rom != ohci->config_rom)
-			dma_free_coherent(ohci->card.device, CONFIG_ROM_SIZE,
-					  ohci->config_rom,
-					  ohci->config_rom_bus);
+		if (ohci->next_config_rom != ohci->config_rom) {
+			free_rom      = ohci->config_rom;
+			free_rom_bus  = ohci->config_rom_bus;
+		}
 		ohci->config_rom      = ohci->next_config_rom;
 		ohci->config_rom_bus  = ohci->next_config_rom_bus;
 		ohci->next_config_rom = NULL;
@@ -992,6 +994,10 @@ static void bus_reset_tasklet(unsigned l
 
 	spin_unlock_irqrestore(&ohci->lock, flags);
 
+	if (free_rom)
+		dma_free_coherent(ohci->card.device, CONFIG_ROM_SIZE,
+				  free_rom, free_rom_bus);
+
 	fw_core_handle_bus_reset(&ohci->card, ohci->node_id, generation,
 				 self_id_count, ohci->self_id_buffer);
 }
@@ -1199,7 +1205,7 @@ ohci_set_config_rom(struct fw_card *card
 {
 	struct fw_ohci *ohci;
 	unsigned long flags;
-	int retval = 0;
+	int retval = -EBUSY;
 	__be32 *next_config_rom;
 	dma_addr_t next_config_rom_bus;
 
@@ -1253,10 +1259,7 @@ ohci_set_config_rom(struct fw_card *card
 
 		reg_write(ohci, OHCI1394_ConfigROMmap,
 			  ohci->next_config_rom_bus);
-	} else {
-		dma_free_coherent(ohci->card.device, CONFIG_ROM_SIZE,
-				  next_config_rom, next_config_rom_bus);
-		retval = -EBUSY;
+		retval = 0;
 	}
 
 	spin_unlock_irqrestore(&ohci->lock, flags);
@@ -1270,6 +1273,9 @@ ohci_set_config_rom(struct fw_card *card
 	 */
 	if (retval == 0)
 		fw_core_initiate_bus_reset(&ohci->card, 1);
+	else
+		dma_free_coherent(ohci->card.device, CONFIG_ROM_SIZE,
+				  next_config_rom, next_config_rom_bus);
 
 	return retval;
 }

-- 
Stefan Richter
-=====-=-=== -=== ==--=
http://arcgraph.de/sr/

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