target/linux/layerscape/patches-5.4/701-net-0111-sdk_qbman-Avoid-variable-length-array-in-USDPAA.patch

   1 From 0ad840e46732e95df274a84b042dcb210be9f946 Mon Sep 17 00:00:00 2001
   2 From: Roy Pledge <roy.pledge@nxp.com>
   3 Date: Thu, 28 Mar 2019 09:56:35 -0400
   4 Subject: [PATCH] sdk_qbman: Avoid variable length array in USDPAA
   5
   6 As of Linux 5.0 variable length arrays on the stack are no
   7 longer allowed. Change to a dynamic array and create a common
   8 exit point in the function for cleanup.
   9
  10 Signed-off-by: Roy Pledge <roy.pledge@nxp.com>
  11 ---
  12  drivers/staging/fsl_qbman/fsl_usdpaa.c | 36 +++++++++++++++++-----------------
  13  1 file changed, 18 insertions(+), 18 deletions(-)
  14
  15 --- a/drivers/staging/fsl_qbman/fsl_usdpaa.c
  16 +++ b/drivers/staging/fsl_qbman/fsl_usdpaa.c
  17 @@ -559,6 +559,7 @@ static bool check_portal_channel(void *c
  18
  19  static int usdpaa_release(struct inode *inode, struct file *filp)
  20  {
  21 +       int err = 0;
  22         struct ctx *ctx = filp->private_data;
  23         struct mem_mapping *map, *tmpmap;
  24         struct portal_mapping *portal, *tmpportal;
  25 @@ -569,9 +570,14 @@ static int usdpaa_release(struct inode *
  26         struct qm_portal_config *qm_alloced_portal = NULL;
  27         struct bm_portal_config *bm_alloced_portal = NULL;
  28
  29 -       struct qm_portal *portal_array[qman_portal_max];
  30 +       struct qm_portal **portal_array;
  31         int portal_count = 0;
  32
  33 +       portal_array = kmalloc_array(qman_portal_max,
  34 +                                    sizeof(struct qm_portal *), GFP_KERNEL);
  35 +       if (!portal_array)
  36 +               return -ENOMEM;
  37 +
  38         /* Ensure the release operation cannot be migrated to another
  39            CPU as CPU specific variables may be needed during cleanup */
  40  #ifdef CONFIG_PREEMPT_RT_FULL
  41 @@ -612,18 +618,14 @@ static int usdpaa_release(struct inode *
  42                 qm_alloced_portal = qm_get_unused_portal();
  43                 if (!qm_alloced_portal) {
  44                         pr_crit("No QMan portal avalaible for cleanup\n");
  45 -#ifdef CONFIG_PREEMPT_RT_FULL
  46 -                       migrate_enable();
  47 -#endif
  48 -                       return -1;
  49 +                       err = -1;
  50 +                       goto done;
  51                 }
  52                 qm_cleanup_portal = kmalloc(sizeof(struct qm_portal),
  53                                             GFP_KERNEL);
  54                 if (!qm_cleanup_portal) {
  55 -#ifdef CONFIG_PREEMPT_RT_FULL
  56 -                       migrate_enable();
  57 -#endif
  58 -                       return -ENOMEM;
  59 +                       err = -ENOMEM;
  60 +                       goto done;
  61                 }
  62                 init_qm_portal(qm_alloced_portal, qm_cleanup_portal);
  63                 portal_array[portal_count] = qm_cleanup_portal;
  64 @@ -633,18 +635,14 @@ static int usdpaa_release(struct inode *
  65                 bm_alloced_portal = bm_get_unused_portal();
  66                 if (!bm_alloced_portal) {
  67                         pr_crit("No BMan portal avalaible for cleanup\n");
  68 -#ifdef CONFIG_PREEMPT_RT_FULL
  69 -                       migrate_enable();
  70 -#endif
  71 -                       return -1;
  72 +                       err = -1;
  73 +                       goto done;
  74                 }
  75                 bm_cleanup_portal = kmalloc(sizeof(struct bm_portal),
  76                                             GFP_KERNEL);
  77                 if (!bm_cleanup_portal) {
  78 -#ifdef CONFIG_PREEMPT_RT_FULL
  79 -                       migrate_enable();
  80 -#endif
  81 -                       return -ENOMEM;
  82 +                       err = -ENOMEM;
  83 +                       goto done;
  84                 }
  85                 init_bm_portal(bm_alloced_portal, bm_cleanup_portal);
  86         }
  87 @@ -721,10 +719,12 @@ static int usdpaa_release(struct inode *
  88         }
  89
  90         kfree(ctx);
  91 +done:
  92  #ifdef CONFIG_PREEMPT_RT_FULL
  93         migrate_enable();
  94  #endif
  95 -       return 0;
  96 +       kfree(portal_array);
  97 +       return err;
  98  }
  99
 100  static int check_mmap_dma(struct ctx *ctx, struct vm_area_struct *vma,