[PATCH 1/3] ehea: fix might sleep problem
From: Jan-Bernd Themann <hidden>
Date: 2008-07-03 14:20:42
A mutex has to be replaced by spinlocks as it can be called from a context which does not allow sleeping. The kzalloc flag GFP_KERNEL has to be replaced by GFP_ATOMIC for the same reason. Signed-off-by: Jan-Bernd Themann <redacted> --- diff -Nurp -X dontdiff linux-2.6.26-rc8/drivers/net/ehea/ehea.h patched_kernel/drivers/net/ehea/ehea.h
--- linux-2.6.26-rc8/drivers/net/ehea/ehea.h 2008-06-25 03:58:20.000000000 +0200
+++ patched_kernel/drivers/net/ehea/ehea.h 2008-07-02 12:38:05.000000000 +0200@@ -452,7 +452,7 @@ struct ehea_bcmc_reg_entry { struct ehea_bcmc_reg_array { struct ehea_bcmc_reg_entry *arr; int num_entries; - struct mutex lock; + spinlock_t lock; }; #define EHEA_PORT_UP 1
diff -Nurp -X dontdiff linux-2.6.26-rc8/drivers/net/ehea/ehea_main.c patched_kernel/drivers/net/ehea/ehea_main.c
--- linux-2.6.26-rc8/drivers/net/ehea/ehea_main.c 2008-06-25 03:58:20.000000000 +0200
+++ patched_kernel/drivers/net/ehea/ehea_main.c 2008-07-02 12:38:05.000000000 +0200@@ -241,7 +241,7 @@ static void ehea_update_bcmc_registratio } if (num_registrations) { - arr = kzalloc(num_registrations * sizeof(*arr), GFP_KERNEL); + arr = kzalloc(num_registrations * sizeof(*arr), GFP_ATOMIC); if (!arr) return; /* Keep the existing array */ } else
@@ -301,7 +301,7 @@ static struct net_device_stats *ehea_get memset(stats, 0, sizeof(*stats)); - cb2 = kzalloc(PAGE_SIZE, GFP_KERNEL); + cb2 = kzalloc(PAGE_SIZE, GFP_ATOMIC); if (!cb2) { ehea_error("no mem for cb2"); goto out;
@@ -1763,7 +1763,7 @@ static int ehea_set_mac_addr(struct net_ memcpy(dev->dev_addr, mac_addr->sa_data, dev->addr_len); - mutex_lock(&ehea_bcmc_regs.lock); + spin_lock(&ehea_bcmc_regs.lock); /* Deregister old MAC in pHYP */ if (port->state == EHEA_PORT_UP) {
@@ -1785,7 +1785,7 @@ static int ehea_set_mac_addr(struct net_ out_upregs: ehea_update_bcmc_registrations(); - mutex_unlock(&ehea_bcmc_regs.lock); + spin_unlock(&ehea_bcmc_regs.lock); out_free: kfree(cb0); out:
@@ -1947,7 +1947,7 @@ static void ehea_set_multicast_list(stru } ehea_promiscuous(dev, 0); - mutex_lock(&ehea_bcmc_regs.lock); + spin_lock(&ehea_bcmc_regs.lock); if (dev->flags & IFF_ALLMULTI) { ehea_allmulti(dev, 1);
@@ -1978,7 +1978,7 @@ static void ehea_set_multicast_list(stru } out: ehea_update_bcmc_registrations(); - mutex_unlock(&ehea_bcmc_regs.lock); + spin_unlock(&ehea_bcmc_regs.lock); return; }
@@ -2497,7 +2497,7 @@ static int ehea_up(struct net_device *de } } - mutex_lock(&ehea_bcmc_regs.lock); + spin_lock(&ehea_bcmc_regs.lock); ret = ehea_broadcast_reg_helper(port, H_REG_BCMC); if (ret) {
@@ -2520,7 +2520,7 @@ out: ehea_info("Failed starting %s. ret=%i", dev->name, ret); ehea_update_bcmc_registrations(); - mutex_unlock(&ehea_bcmc_regs.lock); + spin_unlock(&ehea_bcmc_regs.lock); ehea_update_firmware_handles(); mutex_unlock(&ehea_fw_handles.lock);
@@ -2575,7 +2575,7 @@ static int ehea_down(struct net_device * mutex_lock(&ehea_fw_handles.lock); - mutex_lock(&ehea_bcmc_regs.lock); + spin_lock(&ehea_bcmc_regs.lock); ehea_drop_multicast_list(dev); ehea_broadcast_reg_helper(port, H_DEREG_BCMC);
@@ -2584,7 +2584,7 @@ static int ehea_down(struct net_device * port->state = EHEA_PORT_DOWN; ehea_update_bcmc_registrations(); - mutex_unlock(&ehea_bcmc_regs.lock); + spin_unlock(&ehea_bcmc_regs.lock); ret = ehea_clean_all_portres(port); if (ret)
@@ -3590,7 +3590,7 @@ int __init ehea_module_init(void) memset(&ehea_bcmc_regs, 0, sizeof(ehea_bcmc_regs)); mutex_init(&ehea_fw_handles.lock); - mutex_init(&ehea_bcmc_regs.lock); + spin_lock_init(&ehea_bcmc_regs.lock); ret = check_module_parm(); if (ret)