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Sat, 04 Jan 2020 13:21:32 -0800 (PST) Received: from localhost ([2620:15c:6:12:9c46:e0da:efbf:69cc]) by smtp.gmail.com with ESMTPSA id s18sm67570463pfh.179.2020.01.04.13.21.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 04 Jan 2020 13:21:32 -0800 (PST) Date: Sat, 4 Jan 2020 16:21:31 -0500 From: Joel Fernandes To: madhuparnabhowmik04@gmail.com Message-ID: <20200104212131.GN189259@google.com> References: <20200104144215.27590-1-madhuparnabhowmik04@gmail.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200104144215.27590-1-madhuparnabhowmik04@gmail.com> User-Agent: Mutt/1.10.1 (2018-07-13) Cc: paulmck@kernel.org, linux-kernel@vger.kernel.org, rcu@vger.kernel.org, stefanr@s5r6.in-berlin.de, linux1394-devel@lists.sourceforge.net, linux-kernel-mentees@lists.linuxfoundation.org Subject: Re: [Linux-kernel-mentees] [PATCH] drivers: firewire: core-transaction: Pass lockdep condition to address_handler_list iterator X-BeenThere: linux-kernel-mentees@lists.linuxfoundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-kernel-mentees-bounces@lists.linuxfoundation.org Sender: "Linux-kernel-mentees" On Sat, Jan 04, 2020 at 08:12:15PM +0530, madhuparnabhowmik04@gmail.com wrote: > From: Madhuparna Bhowmik > > The address_handler_list is traversed with list_for_each_entry_rcu > with address_handler_list_lock held. > list_for_each_entry_rcu has built-in RCU and lock checking. > Use it for address_handler_list traversal. > > Signed-off-by: Madhuparna Bhowmik Reviewed-by: Joel Fernandes (Google) thanks, - Joel > --- > drivers/firewire/core-transaction.c | 9 ++++++--- > 1 file changed, 6 insertions(+), 3 deletions(-) > > diff --git a/drivers/firewire/core-transaction.c b/drivers/firewire/core-transaction.c > index 404a035f104d..a15e70027932 100644 > --- a/drivers/firewire/core-transaction.c > +++ b/drivers/firewire/core-transaction.c > @@ -61,6 +61,11 @@ > #define PHY_CONFIG_ROOT_ID(node_id) ((((node_id) & 0x3f) << 24) | (1 << 23)) > #define PHY_IDENTIFIER(id) ((id) << 30) > > +static DEFINE_SPINLOCK(address_handler_list_lock); > +static LIST_HEAD(address_handler_list); > + > +#define address_handler_list_lock_held() lock_is_held(&(address_handler_list_lock).dep_map) > + > /* returns 0 if the split timeout handler is already running */ > static int try_cancel_split_timeout(struct fw_transaction *t) > { > @@ -485,7 +490,7 @@ static struct fw_address_handler *lookup_overlapping_address_handler( > { > struct fw_address_handler *handler; > > - list_for_each_entry_rcu(handler, list, link) { > + list_for_each_entry_rcu(handler, list, link, address_handler_list_lock_held()) { > if (handler->offset < offset + length && > offset < handler->offset + handler->length) > return handler; > @@ -514,8 +519,6 @@ static struct fw_address_handler *lookup_enclosing_address_handler( > return NULL; > } > > -static DEFINE_SPINLOCK(address_handler_list_lock); > -static LIST_HEAD(address_handler_list); > > const struct fw_address_region fw_high_memory_region = > { .start = FW_MAX_PHYSICAL_RANGE, .end = 0xffffe0000000ULL, }; > -- > 2.17.1 > _______________________________________________ Linux-kernel-mentees mailing list Linux-kernel-mentees@lists.linuxfoundation.org https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees