iflib: mark irq allocation name parameter as constant

The *name parameter passed to iflib_irq_alloc_generic and
iflib_softirq_alloc_generic is never modified. Many places in code pass
string literals and thus should not be modified.

Mark the *name parameter as a const char * instead, so that we enforce
that the name is not modified before passing to bus_describe_intr()

Submitted by:	Jacob Keller <jacob.e.keller@intel.com>
Reviewed by:	kmacy
Sponsored by:	Intel Corporation
Differential Revision:	https://reviews.freebsd.org/D15343

4 files changed, 18 insertions, 18 deletions

diff --git a/sys/kern/subr_gtaskqueue.c b/sys/kern/subr_gtaskqueue.c
index 6a5cc65232e6..8a18ed248816 100644
--- a/sys/kern/subr_gtaskqueue.c
+++ b/sys/kern/subr_gtaskqueue.c
@@ -561,7 +561,7 @@ struct taskqgroup_cpu {
 struct taskqgroup {
 	struct taskqgroup_cpu tqg_queue[MAXCPU];
 	struct mtx	tqg_lock;
-	char *		tqg_name;
+	const char *	tqg_name;
 	int		tqg_adjusting;
 	int		tqg_stride;
 	int		tqg_cnt;
@@ -720,7 +720,7 @@ taskqgroup_attach_deferred(struct taskqgroup *qgroup, struct grouptask *gtask)
 
 int
 taskqgroup_attach_cpu(struct taskqgroup *qgroup, struct grouptask *gtask,
-	void *uniq, int cpu, int irq, char *name)
+	void *uniq, int cpu, int irq, const char *name)
 {
 	cpuset_t mask;
 	int i, qid, error;
@@ -961,7 +961,7 @@ taskqgroup_adjust(struct taskqgroup *qgroup, int cnt, int stride)
 }
 
 struct taskqgroup *
-taskqgroup_create(char *name)
+taskqgroup_create(const char *name)
 {
 	struct taskqgroup *qgroup;
 
diff --git a/sys/net/iflib.c b/sys/net/iflib.c
index f20593ed8903..16f1ee0b0f63 100644
--- a/sys/net/iflib.c
+++ b/sys/net/iflib.c
@@ -733,7 +733,7 @@ static int iflib_tx_credits_update(if_ctx_t ctx, iflib_txq_t txq);
 static int iflib_rxd_avail(if_ctx_t ctx, iflib_rxq_t rxq, qidx_t cidx, qidx_t budget);
 static int iflib_qset_structures_setup(if_ctx_t ctx);
 static int iflib_msix_init(if_ctx_t ctx);
-static int iflib_legacy_setup(if_ctx_t ctx, driver_filter_t filter, void *filterarg, int *rid, char *str);
+static int iflib_legacy_setup(if_ctx_t ctx, driver_filter_t filter, void *filterarg, int *rid, const char *str);
 static void iflib_txq_check_drain(iflib_txq_t txq, int budget);
 static uint32_t iflib_txq_can_drain(struct ifmp_ring *);
 static int iflib_register(if_ctx_t);
@@ -1523,8 +1523,8 @@ iflib_fast_intr_ctx(void *arg)
 
 static int
 _iflib_irq_alloc(if_ctx_t ctx, if_irq_t irq, int rid,
-	driver_filter_t filter, driver_intr_t handler, void *arg,
-				 char *name)
+		 driver_filter_t filter, driver_intr_t handler, void *arg,
+		 const char *name)
 {
 	int rc, flags;
 	struct resource *res;
@@ -5395,7 +5395,7 @@ iflib_qset_structures_setup(if_ctx_t ctx)
 
 int
 iflib_irq_alloc(if_ctx_t ctx, if_irq_t irq, int rid,
-				driver_filter_t filter, void *filter_arg, driver_intr_t handler, void *arg, char *name)
+		driver_filter_t filter, void *filter_arg, driver_intr_t handler, void *arg, const char *name)
 {
 
 	return (_iflib_irq_alloc(ctx, irq, rid, filter, handler, arg, name));
@@ -5526,7 +5526,7 @@ get_core_offset(if_ctx_t ctx, iflib_intr_type_t type, int qid)
 /* Just to avoid copy/paste */
 static inline int
 iflib_irq_set_affinity(if_ctx_t ctx, int irq, iflib_intr_type_t type, int qid,
-    struct grouptask *gtask, struct taskqgroup *tqg, void *uniq, char *name)
+    struct grouptask *gtask, struct taskqgroup *tqg, void *uniq, const char *name)
 {
 	int cpuid;
 	int err, tid;
@@ -5549,8 +5549,8 @@ iflib_irq_set_affinity(if_ctx_t ctx, int irq, iflib_intr_type_t type, int qid,
 
 int
 iflib_irq_alloc_generic(if_ctx_t ctx, if_irq_t irq, int rid,
-						iflib_intr_type_t type, driver_filter_t *filter,
-						void *filter_arg, int qid, char *name)
+			iflib_intr_type_t type, driver_filter_t *filter,
+			void *filter_arg, int qid, const char *name)
 {
 	struct grouptask *gtask;
 	struct taskqgroup *tqg;
@@ -5631,7 +5631,7 @@ iflib_irq_alloc_generic(if_ctx_t ctx, if_irq_t irq, int rid,
 }
 
 void
-iflib_softirq_alloc_generic(if_ctx_t ctx, if_irq_t irq, iflib_intr_type_t type,  void *arg, int qid, char *name)
+iflib_softirq_alloc_generic(if_ctx_t ctx, if_irq_t irq, iflib_intr_type_t type,  void *arg, int qid, const char *name)
 {
 	struct grouptask *gtask;
 	struct taskqgroup *tqg;
@@ -5688,7 +5688,7 @@ iflib_irq_free(if_ctx_t ctx, if_irq_t irq)
 }
 
 static int
-iflib_legacy_setup(if_ctx_t ctx, driver_filter_t filter, void *filter_arg, int *rid, char *name)
+iflib_legacy_setup(if_ctx_t ctx, driver_filter_t filter, void *filter_arg, int *rid, const char *name)
 {
 	iflib_txq_t txq = ctx->ifc_txqs;
 	iflib_rxq_t rxq = ctx->ifc_rxqs;
diff --git a/sys/net/iflib.h b/sys/net/iflib.h
index 6fd71fd52c43..140c488bee09 100644
--- a/sys/net/iflib.h
+++ b/sys/net/iflib.h
@@ -404,11 +404,11 @@ int iflib_device_deregister(if_ctx_t);
 
 
 
-int iflib_irq_alloc(if_ctx_t, if_irq_t, int, driver_filter_t, void *filter_arg, driver_intr_t, void *arg, char *name);
+int iflib_irq_alloc(if_ctx_t, if_irq_t, int, driver_filter_t, void *filter_arg, driver_intr_t, void *arg, const char *name);
 int iflib_irq_alloc_generic(if_ctx_t ctx, if_irq_t irq, int rid,
-							iflib_intr_type_t type, driver_filter_t *filter,
-							void *filter_arg, int qid, char *name);
-void iflib_softirq_alloc_generic(if_ctx_t ctx, if_irq_t irq, iflib_intr_type_t type,  void *arg, int qid, char *name);
+			    iflib_intr_type_t type, driver_filter_t *filter,
+			    void *filter_arg, int qid, const char *name);
+void iflib_softirq_alloc_generic(if_ctx_t ctx, if_irq_t irq, iflib_intr_type_t type,  void *arg, int qid, const char *name);
 
 void iflib_irq_free(if_ctx_t ctx, if_irq_t irq);
 
diff --git a/sys/sys/gtaskqueue.h b/sys/sys/gtaskqueue.h
index e8cfef044268..c06ef503c11e 100644
--- a/sys/sys/gtaskqueue.h
+++ b/sys/sys/gtaskqueue.h
@@ -56,9 +56,9 @@ int grouptaskqueue_enqueue(struct gtaskqueue *queue, struct gtask *task);
 void	taskqgroup_attach(struct taskqgroup *qgroup, struct grouptask *grptask,
 	    void *uniq, int irq, const char *name);
 int		taskqgroup_attach_cpu(struct taskqgroup *qgroup, struct grouptask *grptask,
-		void *uniq, int cpu, int irq, char *name);
+		void *uniq, int cpu, int irq, const char *name);
 void	taskqgroup_detach(struct taskqgroup *qgroup, struct grouptask *gtask);
-struct taskqgroup *taskqgroup_create(char *name);
+struct taskqgroup *taskqgroup_create(const char *name);
 void	taskqgroup_destroy(struct taskqgroup *qgroup);
 int	taskqgroup_adjust(struct taskqgroup *qgroup, int cnt, int stride);
 void	taskqgroup_config_gtask_init(void *ctx, struct grouptask *gtask, gtask_fn_t *fn,