6.6-stable review patch. If anyone has any objections, please let me know.
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From: Mahesh Rao mahesh.rao@altera.com
commit 85f96cbbbc67b59652b2c1ec394b8ddc0ddf1b0b upstream.
Add mutex lock to stratix10_svc_allocate_memory and stratix10_svc_free_memory for thread safety. This prevents race conditions and ensures proper synchronization during memory operations. This is required for parallel communication with the Stratix10 service channel.
Fixes: 7ca5ce896524f ("firmware: add Intel Stratix10 service layer driver") Cc: stable@vger.kernel.org Signed-off-by: Mahesh Rao mahesh.rao@altera.com Reviewed-by: Matthew Gerlach matthew.gerlach@altera.com Signed-off-by: Dinh Nguyen dinguyen@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/firmware/stratix10-svc.c | 11 +++++++++++ 1 file changed, 11 insertions(+)
--- a/drivers/firmware/stratix10-svc.c +++ b/drivers/firmware/stratix10-svc.c @@ -1,6 +1,7 @@ // SPDX-License-Identifier: GPL-2.0 /* * Copyright (C) 2017-2018, Intel Corporation + * Copyright (C) 2025, Altera Corporation */
#include <linux/completion.h> @@ -176,6 +177,12 @@ static LIST_HEAD(svc_ctrl); static LIST_HEAD(svc_data_mem);
/** + * svc_mem_lock protects access to the svc_data_mem list for + * concurrent multi-client operations + */ +static DEFINE_MUTEX(svc_mem_lock); + +/** * svc_pa_to_va() - translate physical address to virtual address * @addr: to be translated physical address * @@ -187,6 +194,7 @@ static void *svc_pa_to_va(unsigned long struct stratix10_svc_data_mem *pmem;
pr_debug("claim back P-addr=0x%016x\n", (unsigned int)addr); + guard(mutex)(&svc_mem_lock); list_for_each_entry(pmem, &svc_data_mem, node) if (pmem->paddr == addr) return pmem->vaddr; @@ -996,6 +1004,7 @@ int stratix10_svc_send(struct stratix10_ p_data->flag = ct->flags; } } else { + guard(mutex)(&svc_mem_lock); list_for_each_entry(p_mem, &svc_data_mem, node) if (p_mem->vaddr == p_msg->payload) { p_data->paddr = p_mem->paddr; @@ -1078,6 +1087,7 @@ void *stratix10_svc_allocate_memory(stru if (!pmem) return ERR_PTR(-ENOMEM);
+ guard(mutex)(&svc_mem_lock); va = gen_pool_alloc(genpool, s); if (!va) return ERR_PTR(-ENOMEM); @@ -1106,6 +1116,7 @@ EXPORT_SYMBOL_GPL(stratix10_svc_allocate void stratix10_svc_free_memory(struct stratix10_svc_chan *chan, void *kaddr) { struct stratix10_svc_data_mem *pmem; + guard(mutex)(&svc_mem_lock);
list_for_each_entry(pmem, &svc_data_mem, node) if (pmem->vaddr == kaddr) {